CN1033601C - Displacement-type rotary system steam-turbine engine - Google Patents

Abstract

The present invention relates to a volume type rotating system steam turbine which mainly performs the function of a volume type steam engine. Through partly using dynamic energy generated by steam molecules impacting rotor blades, the present invention also performs the function of a radial-flow type steam turbine.

Description

Displacement-type rotary system steam-turbine engine

The present invention relates to rotate steam turbine, particularly relate to a kind of improvement of positive displacement rotation steam turbine.

In the past, the inventor that some are famous as watt, Murdoch, Hornblower, Trevithick, Sven-Gan Eriksson, maudslay etc., has made dissimilar rotary steam turbine, but all these steam turbine all have some shortcoming, so that have hindered its successful application.That made in the past most large-scalely revolves rotary steam turbine and extreme serious sealing problem occurred, and all failed, its reason mainly is that uncontrollable steam leaks in a large number, cause volumetric efficiency to reduce greatly, one of main purpose of the present invention is to introduce the contactless gear type labyrinth gland that a kind of large revolving steam turbine is used, its Steam loss is very little, thereby has improved volumetric efficiency greatly.At present, owing to be subjected to corrosion and corrosion (as influences such as the cavitation erosion of rotor blade and other part or pit corrosions).Conventional steam turbine or any other rotary steam turbine are much higher than at steam temperature that operation is uneconomic under 560 ℃ the condition.So a free-revving engine of the present invention is to introduce a kind of can being higher than at steam temperature to work under 560 ℃ of conditions and do not need the cooled rotor blade and do not need to adopt the large revolving steam turbine of expensive special steel.Can't be manufactured on the large revolving steam turbine that moves under vapor pressure and the high speed conditions at present, its reason is that interior pressure can not complete equilibrium.So another object of the present invention is to introduce the rotary steam turbine of a kind of inner radial and axial pressure complete equilibrium.Another free-revving engine of the present invention is that the torque of power take-off drive shaft is exerted oneself continuously steadily, to satisfy the needs of high-energy conversion.Conventional steam turbine is only most effective under full load and high-revolving operating mode.Under the partial load operating mode, conventional Efficiency of Steam Turbine descends rapidly.So another also is most important purpose is to show a kind of can the operation under various load behaviors, and its efficient equals even be higher than the rotary steam turbine of working efficiency under the full load operating mode.Another purpose of the present invention is to introduce a kind ofly can cross wet vapor.The following rotary steam turbine of operation of degasification steam and the steam condition that contains a large amount of impurity not.

The objective of the invention is to make a kind of displacement-type rotary system steam-turbine engine, it mainly plays the displacement steam turbine effect, simultaneously, partly utilize the steam molecule that flows fast to impact the function that on rotor blade, produces, thereby can play similar radial(-flow) turbine.Apparatus of the present invention are made of first casing and second casing, and the two halves casing borrows its flange installation limit closely to be bonded together with bolt up and down.The two-stage turbine of internal pressure and incomplete equilibrium preferably is made up of three vane rotor chambeies, six groove rotor chamber and a gear cavity, on these chamber internal rotors axle that is installed in separately parallel to each other.Each machine chamber preferably is made up of three linear array and crossing cylindrical shape one-level or secondary chamber, and an one-level or secondary vane rotor are installed in the chamber, and in this vane rotor left and right sides level two one-levels or secondary groove rotor is installed.The gear cavity that is positioned at the casing end depends on specific root diameter, and the diameter gear identical with root diameter is housed in the chamber.Diameter is very big preferably to be equipped with five less gears with the high rotor of rotating speed, to reduce circumference of gear speed as far as possible.One-level and two secondary vane rotors and that gearwheel are installed on the same axle.Every group of groove rotor and corresponding small gear thereof also are installed on the common axle.Every group of vane rotor and corresponding small gear thereof also are contained on the common axle.Every group of vane rotor chamber and corresponding grooves rotor chamber thereof separate with other group chamber and gear cavity sealing.The arrangement mode of vane rotor and the lip-deep pinion type tooth of groove rotor circumference makes this rotor can realize contactless engagement when its axle separately rotates.Gearwheel and small gear all pass through precise finish, and it is very accurate to mesh, to guarantee that this contactless engagement rotor rotates synchronously.For each chamber is provided with corresponding inlet and outlet, import and the radially opposite setting of outlet and pass to corresponding vane rotor chamber on casing.Vertically being installed in the lip-deep thick rotor blade of this vane rotor is uniformly distributed along the circumference.The groove rotor has the blade groove of respective numbers, and the groove number becomes with the mutual ratio of revolutions of corresponding number of rotor blades and rotor.In order on power take-off drive shaft, to obtain continuously torque stably, this rotor blade and the contactless engagement in surface of this blade groove, leave enough vapour cracks simultaneously, with on prevent to be stressed in this chamber one-sided turbine blade of exerting pressure of working medium and the same vane rotor another with turbine blade that the respective leaves film trap of groove rotor is meshed between produce one-sided pressure.Interior pressing weighing apparatus between two above-mentioned blades will cause periodically moment of torsion to be offset, and this is conspicuous on power take-off drive shaft because exert oneself inhomogeneous when macro-energy change horse back can confirm it is disadvantageous.Be equipped with less gear type tooth between this rotor blade and blade and this blade groove and the blade groove.This gear type tooth does not contact with the complementary teeth of corresponding rotor, but very closely engagement, and between two rotors that are meshed, form the wheeled sealing effect of labyrinth teeth very effective, no kinetic friction, thus reach high volumetric efficiency.When the miniature gear formula tooth of the rotor blade of this vane rotor and groove rotor rotates around its corresponding axle, being close to nearly its corresponding hollow tubular internal chamber wall moves, and form the labyrinth sealing effect of no kinetic friction jointly with its gear type tooth, make to be in cylindrical cavity part that contains working medium under the pressure state and the cylindrical cavity part sealed separation that contains working medium that is in the demi-inflation state.Sealing effect partly is divided at least two kinds of pressure states different and that sealing separates with this cylindrical cavity.When this rotor blade closely passed through its corresponding cavity, the spatial volume wigner effect of the pressure medium in this cavity part produced continuous rotation operating mode by exerting pressure continuously to the side in the face of sense of rotation of rotor blade.Further reach the purpose that obtains high volumetric efficiency as demi-inflation working medium cavity volume by two groups of secondary rotor chamber utilizing both sides, primary rotor chamber.Done work by making this rotor blade produce displacement state in this primary rotor chamber by the pressurization working medium that primary rotor chamber inlet enters, expanding then enters in two secondary rotor chamber that are interconnected.The total measurement (volume) of two secondary rotor chamber is than the big manyfold in previous primary rotor chamber.Therefore, the leak-down rate of the working medium of each working fluid chamber internal pressure reduction is relatively much lower.Thereby the energy in the demi-inflation loss working medium is also just much lower.So when secondary rotor chamber total measurement (volume) increased relatively than primary rotor chamber volume, the energy loss that refrigerant leakage causes then reduced, thereby the actual leakage rate of working medium is reduced to a very little numerical value, and volumetric efficiency is correspondingly improved greatly.Corrosion in the steam turbine and corrosion strengthen with the working medium increase in temperature.So, adopt the rotor cooling means and the working medium temperature reduced corrosion in the steam turbine and corrosion meeting are produced a contrary effect.The method of head it off is when making the cylindrical cavity wall.Only make about half of vane rotor external peripheral surface to be exposed to high temperature refrigerant, and second half of vane rotor external peripheral surface is exposed to the working medium of lowering the temperature significantly because of demi-inflation, thereby realized corresponding cooling.Along with the increasing of the area that is exposed to cooling medium and the temperature difference, the cooling capacity rising that will be in line.Along with the increasing of refrigerant flow rate, corrosion and corrosion influence also strengthen.Because the wigner effect of apparatus of the present invention, refrigerant flow rate exceeds not quite than this vane rotor peripheral velocity, thereby has correspondingly reduced corrosion and corrosion influence.Opposite with the thin rotor blade of conventional steam turbine, rotor blade of the present invention is designed to very thick very short, thus just might adopt special materials such as various cover coats or pottery, thus further reduce corrosion and corrosion influence to rotor blade.

The way that further reduces corrosion and corrosion is made vane rotor and rotor blade hollow, and carries out interior cold with cooling medium.The pressure balance way of vane rotor is that the lip-deep rotor blade of vane rotor is become the even number setting, and the import of cylindrical cavity and outlet radially are provided with mutually on the contrary, makes the moment of its generation opposite and cancel each other.In order to eliminate the moment of groove rotor fully, between one-level and secondary groove rotor, on its corresponding axis, increase by two pressure balanced rotor.Two pressure balanced rotor circumferential surfaces all polish, and in order to offset whole back-pressure moments, and make size take advantage of a pressure face seal suitable with direction, and receive on the primary rotor inlet with pipe.So just can finish the pressure balance under the various pressure states automatically.Thereby the power that whole radial and axial power even rotor weight produce can both obtain balance, and each the stage pressure rotor among the present invention can both be moved under vapor pressure and high-speed state.The above-mentioned structure of apparatus of the present invention can resemble it to reduce high pressure steam one-level or the secondary radial-flow type tandem compound turbine.A speed regulator can be regulated used power pressure of displacement process and volume.So just provide a kind of excellent performance, thermal efficiency height and total efficiency high very practical turbine system.

The present invention also can be used as turbine and pump or compressor associating unit and uses.

Further application area of the present invention comprises that also purposes of the present invention such as compressor, pump, motor can realize by following measure:

A kind of displacement-type rotary system steam-turbine engine, comprise several casings of lining up the cylindrical chamber of row, several parallel axles, these spin axis becomes to overlap with the center in said chamber, a rotor, radial groove puts equally spaced pressure blade on the rotor, rotor is installed on the central shaft, at least two rotors, outer surface at them has radial groove, these grooves are corresponding to the position of pressure blade, said two rotors are installed in the position near vane rotor, said rotor is placed in the chamber of casing, and be combined under the motion state each other and limit active chamber in the casing, the heavy casing bus of the import of working fluid and outlet passage in pairs and radially opposite setting, thereby the moment of generation is cancelled out each other, a device that makes the synchronous rotation of described several axles, comprise the engaging gear that is arranged on these axle heads, it is characterized in that, improve volumetric efficiency by reducing leakage and the radial and axial pressure of balance, be provided with the device in seal operation chamber, surface in chassis chamber is provided with the sealing inserted sheet of two circular arcs, zone at vane rotor produces no frictional power sealing with pressure blade, thereby working fluid is entered breathing space and compressing area respectively, the outer surface of rotor is provided with tip edge, is used for being limited to the tooth of vane rotor and the no frictional power labyrinth sealing between each groove rotor.

Purpose of the present invention can also realize by following measure:

Seal arrangement comprises seal ring, diaphragm seal and Sealing, and seal ring is installed in the active chamber both sides of axle in the casing, and diaphragm seal is installed in the side surface of chamber, and Sealing is installed in the casing, forms contactless sealing in the zone of groove rotor.Also be provided with other active chamber, separated by dividing plate radially, and be provided with continuously at the axial direction of described several axles, each said chamber all has the passage that radially oppositely is provided with to send into and discharge working fluid.Be provided with balancing rotor and other seal arrangement, coaxial cylindrical chamber is arranged in the casing between active chamber vertically, thereby qualification pressure balance chamber, each pressure balance chamber puts pressure balanced rotor, and other seal arrangement and other fluid infeed to send into discharge route with working fluid respectively with discharge route and be communicated with.Other seal arrangement is the circular arc diaphragm seal that is provided with in pairs near balancing rotor in casing.The pressure blade number of vane rotor is an even number.The circumferential surface of each blade is provided with groove, to produce a sealing between blade and said sealing inserted sheet.Rotor is arranged in the casing, and the engagement of tip edge will limit the rotation that an other device comes synchronous said several axles like this.Said sealing inserted sheet is arranged on the part of chassis chamber, and infeeds between passage and the discharge route at working fluid, is infeeding passage one side.Also having characteristics is that the number of gears is greater than the number of axle.Said sealing inserted sheet, the Manufacturing material of diaphragm seal and Sealing is different with the Manufacturing material of pressure blade and pressure rotor.For ease of maintenance, the groove of vane rotor is a T shape.Said sealing inserted sheet diaphragm seal and Sealing can be made with the material that surface of contact avoids blocking by a kind of.The discharge passage of described active chamber is to be connected with the discharge passage of pressure balance chamber and the working fluid service duct of active chamber.The pressure blade of vane rotor is meshed with the radial groove of adjacent rotor in contactless mode, and limits a gap betwixt.Described pressure blade is meshed with described radial groove in order, thereby limits a continuous gap between it, thereby produces a constant substantially moment of torsion on central shaft.

Rotary steam turbine than routine, positive displacement rotation steam turbine Steam loss of the present invention is very little, thereby improved volumetric efficiency greatly, conventional rotary steam turbine, can not move under the high speed conditions of vapor pressure, its reason is that interior pressure can not complete equilibrium, and the present invention then is the rotary steam turbine of a kind of inner radial and axial pressure complete equilibrium, steam turbine of the present invention can also make the torque of power take-off drive shaft exert oneself continuously steadily, thereby satisfies the needs of high-energy conversion.

Other purpose of the present invention is by obtaining clearer understanding referring to accompanying drawing with to various embodiments' detailed introduction.The identical structure division of identical numbering representative in the accompanying drawing.

The front elevation of Fig. 1 for vertically cutting open along primary rotor group switching centre of the present invention.

The front elevation of Fig. 2 for cutting open along pressure balanced rotor central vertical of the present invention.

The side view that Fig. 3 vertically cuts open for apparatus of the present invention, it also shows two pressure balanced rotor.

Fig. 4 a and 4b are vane rotor of the present invention and the partial vertical cutaway view Amplified image of not comparing with the vane rotor of gear type tooth.

As shown in figures 1 and 3, apparatus of the present invention are made up of first casing 1 and second casing 2.Firsts and seconds rotor chamber group is arranged in the casing 1 and 2, the firsts and seconds rotor is arranged respectively in the chamber.There is a big circular vane rotor chamber centre, its each side horizontal parallel a small circular groove rotor chamber is set.First casing is installed limit 7 usefulness bolts with second casing by the flange of polishing and is tightened in.Two upper and lower enclosures 1 and 2 are provided with inlet 3,5 and export 4,6, and this imports and exports radially opposite position mutually.For support machine casing, support 8 and 9 rigidity are installed on second casing.In this big round chamber, one-level vane rotor 12 is installed on the axle 14, is in the housing central position.Simultaneously, in the both sides of one-level vane rotor 12, fluted rotor 15 and 16 and be installed in respectively separately the axle 17 and 18 on.Vertically being installed in these vane rotor 12 lip-deep thick rotor blades 13 is uniformly distributed along the circumference.Groove rotor 15 and 16 has the blade groove 19 and 20 of respective numbers, and this groove number becomes with rotor blade 13 numbers and mutual ratio of revolutions.Rotor blade 13 and blade groove 19 and 20 contactless engagements.Rotor blade 13 is close to nearly adjustable (preferably metal) empiecement 10 and 11 and is contactlessly moved, so just with the inlet 3 of machine chamber side and 5 and the outlet 4 and 6 sealings of machine chamber side, so when sending into pressurizing medium (for example steam) by radially opposite inlet 3 and 5, just can reach continuous rotary work state.This metallic rotator chamber diaphragm seal 10 and 11 preferably adopts and can come in contact the material that Shi Buhui blocks with rotor blade 13.The side sealing sheet 38 in machine chamber and 39 usefulness can prevent the made blocked with rotor blade 13 and vane rotor and groove rotor.Simultaneously, less gear type tooth 21 and 22 is being arranged between this rotor blade 13 and between the blade groove 19,20.This gear type tooth 21 and 22 contactless engagements, but very tight with the complementary teeth engagement of relative rotor, between this rotor, produce the tooth-like sealing effect in labyrinth very effective, no kinetic friction.Groove rotor 15 and 16 gear type tooth 22 be closely near diaphragm seals 23 and 24 rotations, but do not contact, thus near the rotor chamber side of inlet 3 and 5 with produce sealing effect near exporting between 6 and 4 the rotor chamber side.The contactless engagement of all rotors is finished by synchromesh gear shown in Figure 3 40.In order to have the function of double expansion turbine, second level vane rotor 34 and 35 is installed on the common central shaft 14, is contained in the both sides of this first order vane rotor 12, and corresponding secondary groove rotor then is installed on the axle 17 and 18.Therefore total measurement (volume) between vane rotor 34 and 35 two adjacent rotor blades, can produce corresponding secondary steam inside and expand than the big manyfold of vane rotor 12.Between vane rotor 34,12 and 35, be provided with pressure balanced rotor 25a, 25b and 26a, 26b, be contained in respectively on the axle 17 and 18.Fig. 2 illustrates pressure balanced rotor 25a and the 25b that is contained in respectively on the axle 17 and 18.A labyrinth 27,28,29 and 30 parts with the polished surface of pressure balanced rotor 25a and 25b contactlessly seal with rotor chamber 50 and separate.Inlet 3 and 5 is communicated with inlet 31 and 32, thereby produces an identical pressure automatically, radially is applied on the surface of pressure balanced rotor 25a, 25b and 26a, 26b and groove rotor 15 and 16, to reach the pressure complete equilibrium.Opposite with the groove rotor, vane rotor 12,34 and 35 cancels out each other rightabout pressure because vapor pressure always radially produces on the contrary, so its pressure complete equilibrium always.The outlet 4 in vane rotor 12 chambeies and 6 and the outlet 33 in pressure balanced rotor chamber is communicated with the rotor chamber inlet of vane rotor 34 and 35, the steam that leaks is become additional working medium, thereby the volumetric efficiency of raising apparatus of the present invention.

Among Fig. 4 not with two rotor surface of revolution 51 and 52 of gear type tooth 21 and 22, though pitch circle 47 and 48 equates that the Steam loss of the rotor blade 49 by contactless engagement and the gap 43a of respective rotor groove 20 and 44a is very big.Under pitch circle 47 and 48 situations about equating, much smaller because contactless meshed gears formula tooth 21 and 22 has sealability by the Steam loss of gap 43b and 44b, thereby increased volumetric efficiency significantly.Gap 43 and 44 can prevent that the vapor pressure between as shown in the figure the rotor blade 13 and 49 from raising, otherwise between this rotor blade the internal pressure balance will appear, and causing periodically moment of torsion to offset, this point is by power take-off drive shaft inhomogeneous can the seeing of exerting oneself.Rotor blade is installed in the T type groove 41, and is fluted 42 on blade tip, to strengthen its labyrinth seal ability.Be equipped with in the side of all rotors and can prevent the diaphragm seal 38 and 39 that blocks.Because the rotor pressure balance has only minimum masterpiece to be used on rotor shaft 14,17 and 18, so just can adopt high rotating speed ball bearing 45 and 46. Sealing 36 and 37 makes between each rotor chamber and seals.

Apparatus of the present invention are used as the associating unit of turbine and pump or compressor, its method is to come compressed media (for example air) with two vane rotors 34 and 35, with the outlet of inlet, and will export, and do work by described displacement mode with vane rotor 12 as inlet as this medium.Be familiar with this professional people and be readily appreciated that the present invention can have various application forms, as compressor, pump and motor etc.Notice is introduced here and disclosed various embodiments just enumerate as an example, under the condition that does not break away from the spirit and scope of the present invention, can further make other remodeling.

Claims (16)

1. displacement-type rotary system steam-turbine engine, comprise several casings of lining up the cylindrical chamber of row, several parallel axles, these spin axis becomes to overlap with the center in said chamber, a rotor, radial groove puts equally spaced pressure blade on the rotor, rotor is installed on the central shaft, at least two rotors, outer surface at them has radial groove, these grooves are corresponding to the position of pressure blade, said two rotors are installed in the position near vane rotor, said rotor is placed in the chamber of casing, and be combined under the motion state each other and limit active chamber in the casing, the heavy casing bus of the import of working fluid and outlet passage in pairs and radially opposite setting, thereby the moment of generation is cancelled out each other, a device that makes the synchronous rotation of described several axles, comprise the engaging gear that is arranged on these axle heads, it is characterized in that, improve volumetric efficiency by reducing leakage and the radial and axial pressure of balance, be provided with the device in seal operation chamber, the sealing inserted sheet of two circular arcs is set at the internal surface of chassis chamber, zone at vane rotor produces no frictional power sealing with pressure blade, thereby working fluid is entered breathing space and compressing area respectively, the outer surface of rotor is provided with tip edge, is used for being limited to the tooth of vane rotor and the no frictional power labyrinth sealing between each groove rotor.

2. according to the described steam turbine of claim 1, it is characterized in that, said seal arrangement comprises seal ring, diaphragm seal and Sealing, seal ring is installed in the active chamber both sides of axle in the casing, and diaphragm seal is installed in the side surface of chamber, Sealing is installed in the casing, forms contactless sealing in the zone of groove rotor.

3. according to the described steam turbine of claim 1, it is characterized in that also there is not other active chamber, separated by dividing plate radially, and be provided with continuously at the axial direction of described youngster's root axle, each said chamber all has the passage that radially oppositely is provided with to send into and discharge working fluid.

4. according to the described steam turbine of above each claim, it is characterized in that, be provided with balancing rotor and other seal arrangement, coaxial cylindrical chamber is arranged in the casing between active chamber vertically, thereby qualification pressure balance chamber, each pressure balance chamber puts pressure balanced rotor, and other seal arrangement and other fluid infeed to send into discharge route with working fluid respectively with discharge route and be communicated with.

5. according to the described steam turbine of claim 4, it is characterized in that other seal arrangement is the circular arc diaphragm seal that is provided with in pairs near balancing rotor in casing.

6. according to the described steam turbine of claim 5, it is characterized in that the pressure blade number of vane rotor is an even number.

7. according to the described steam turbine of claim 5, it is characterized in that the circumferential surface of each blade is provided with groove, between blade and said sealing inserted sheet, to produce a sealing.

8. according to the described steam turbine of claim 5, it is characterized in that rotor is arranged in the casing, the engagement of tip edge will limit the rotation that an other device comes synchronous said several axles like this.

9. according to the described steam turbine of claim 5, it is characterized in that said sealing inserted sheet is arranged on the part of chassis chamber, and infeed between passage and the discharge route, infeeding passage one side at working fluid.

10. according to the described steam turbine of claim 5, it is characterized in that the number of gears is greater than the number of axle.

11. according to the described steam turbine of claim 5, it is characterized in that, said sealing inserted sheet, the Manufacturing material of diaphragm seal and Sealing is different with the Manufacturing material of pressure blade and pressure rotor.

12., it is characterized in that for ease of maintenance, the groove of vane rotor is a T shape according to the described steam turbine of claim 5.

13., it is characterized in that said sealing inserted sheet diaphragm seal and Sealing can be made with the material that surface of contact avoids blocking by a kind of according to the described steam turbine of claim 5.

14., it is characterized in that the discharge passage of described active chamber is to be connected with the discharge passage of pressure balance chamber and the working fluid service duct of active chamber according to the described steam turbine of claim 5.

15., it is characterized in that the pressure blade of vane rotor is meshed with the radial groove of adjacent rotor in contactless mode according to the described steam turbine of claim 5, and limit a gap betwixt.

16., it is characterized in that described pressure blade is meshed with described radial groove in order according to the described steam turbine of claim 15, thereby between it, limit a continuous gap, thereby on central shaft, produce a constant substantially moment of torsion.

Images